package com.demo;

import java.util.HashMap;
import java.util.Map;

/**
 * @author tuzhijin
 * @version Id: MyClassLoader.java, v 0.1 2021/4/13 上午11:31 tuzhijin Exp $$
 */
public class MyClassLoader extends ClassLoader {
    protected MyClassLoader(ClassLoader parent) {
        super(parent);

    }

    public static void main(String[] args) {
        Map<String, Object> map = new HashMap<>();
        map.put(null, 1);
    }
}
